Modifications for the Kenwood TS-940

Picture(s) of Kenwood - TS-940

19-07-1998 TS-940S LCD Clock Display Erratic Operation English language (1 Kbytes)
19-07-1998 TS-940S SSB Talk Power Improvement English language (36 Kbytes)
19-07-1998 TS-940S Erratic display English language (3 Kbytes)
19-07-1998 RX AUDIO English language (1 Kbytes)
19-07-1998 Amtor switching time English language (0 Kbytes)
19-07-1998 ALC time constant English language (1 Kbytes)
19-07-1998 TS-940 Mod for MARS and all band operations English language (0 Kbytes)
15-04-2000 TS-940S PLL unlock English language
15-04-2000 TS-940S Antenna Tuner Relays English language (22 Kbytes)
15-04-2000 TS-940S PLL unlock English language (26 Kbytes)
15-04-2000 TS-940S AVR unit capacitor change English language (31 Kbytes)
15-04-2000 TS-940S AGC circuit improvements English language (35 Kbytes)
15-04-2000 TS-940S Signal to noise ratio improvement English language (11 Kbytes)
15-04-2000 TS-940S VCO carrier to noise ratio improvement English language (53 Kbytes)
15-04-2000 TS-940S Squelch switching noise English language (18 Kbytes)
21-04-2000 TS-940S MRF-485 Driver Transistor Notes English language (37 Kbytes)
24-02-2001 TS-940 PA drivers replacement English language (50 Kbytes)
 View all modification in one click. This can be a very big file.!! (332 Kbytes)

15-04-2000
TS-940S PLL unlock
Author: Trio-Kenwood Communication, inc.


Service Bulletin no. 900 (18-10-1985)

Some users of the TS-940S have reported a blanking of the display accompanied by a loss of transmit and receive. Readjustment of the PLL unit will correct this tendency.

Procedure:

  1. Set the Dial frequency for approximately 1.8 MHz (inside the band).

  2. Using an RF probe at TP5 adjust L22, L23, and L24 for a maximum reading on the meter. You should see approximately 250 mV.

  3. Adjustment of L24 will produce the greatest change, which may be up to a 90 adjustment from its present position.

Time required for the procedure is .5 hour or less.

This modification is read 378 times.

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